Simplify urlname generating

There is no need to rebuild every ancestors slug since we already have the parents urlname we can append the slug to.

app/models/alchemy/page/page_naming.rb

@@ -35,7 +35,7 @@ def renamed?
     # Makes a slug of all ancestors urlnames including mine and delimit them be slash.
     # So the whole path is stored as urlname in the database.
     def update_urlname!
-      new_urlname = nested_url_name(slug)
+      new_urlname = nested_url_name
       if urlname != new_urlname
         legacy_urls.create(urlname: urlname)
         update_column(:urlname, new_urlname)
@@ -47,19 +47,6 @@ def slug
       urlname.to_s.split("/").last
     end
 
-    # Returns an array of non-language_root ancestors.
-    def non_root_ancestors
-      return [] unless parent
-
-      if new_record?
-        parent.non_root_ancestors.tap do |base|
-          base.push(parent) unless parent.language_root?
-        end
-      else
-        ancestors.contentpages.where(language_root: nil).to_a
-      end
-    end
-
     private
 
     def update_descendants_urlnames
@@ -71,7 +58,7 @@ def update_descendants_urlnames
     # Either from name, or if present, from urlname.
     # The urlname contains the whole path including parent urlnames.
     def set_urlname
-      self[:urlname] = nested_url_name(slug)
+      self[:urlname] = nested_url_name
     end
 
     def set_title
@@ -83,26 +70,17 @@ def set_title
     # Names shorter than 3 will be filled up with dashes,
     # so it does not collidate with the language code.
     #
-    def convert_url_name(value)
-      url_name = convert_to_urlname(value.blank? ? name : value)
-      if url_name.length < 3
-        ("-" * (3 - url_name.length)) + url_name
-      else
-        url_name
-      end
-    end
-
-    def nested_url_name(value)
-      (ancestor_slugs << convert_url_name(value)).join("/")
+    def converted_url_name
+      url_name = convert_to_urlname(slug.blank? ? name : slug)
+      url_name.rjust(3, "-")
     end
 
-    # Slugs of all non-language_root ancestors.
-    # Returns [], if there is no parent, the parent is
-    # the root page itself.
-    def ancestor_slugs
-      return [] if parent.nil?
-
-      non_root_ancestors.map(&:slug).compact
+    def nested_url_name
+      if parent&.language_root?
+        converted_url_name
+      else
+        [parent&.urlname, converted_url_name].compact.join("/")
+      end
     end
   end
 end